docs: document create template and PDF outline upload [sc-17034] - #1453

What and why?

Documents net-new document template creation for SC-17034 covering shipped work from SC-16316.

Implementation: frontend#2637, backend#3240.

Before: Manage document templates covered view, outline edit, swap, duplicate (details page only), and delete — but not creating a blank template or generating an outline from PDF.

After:

• Intro and prerequisites distinguish Create Template / Delete Template (Customer Admin) vs swap permissions
• New Create document templates section: create blank template under Development / Validation / Monitoring / Custom, then Build Outline Manually or Start Outline From PDF
• PDF limits and structure-only outline behavior documented; progress tracked in My Inbox
• Duplicate documents both list Actions menu and template details
• FAQ notes create-from-scratch / PDF outline option

How to test

1. Mark this PR ready for review (draft PRs skip the preview validate job).
2. Wait for the validate check to pass and deploy the hosted preview.
3. Review:
   • Manage document templates (Create section)
   • Documents and templates FAQ
   • Customizing Your Inventory (training) (duplicate include)
4. Confirm create flow matches Settings → Documents → Templates → Create [Type] Template, then blank-outline manual vs PDF options.
5. Confirm duplicate from list Actions and from details still match.

Production for comparison:

• https://docs.validmind.com/guide/templates/manage-document-templates.html

Optional local render:

skills/validmind-docs-coverage/scripts/render-pages.sh \
  guide/templates/manage-document-templates.qmd \
  training/administrator-fundamentals/customizing-your-inventory.qmd \
  faq/faq-documentation.qmd

What needs special review?

• Create modal does not ask for template type; type comes from the active Templates tab (shipped FE), not the original AC mock that included a type dropdown.
• PDF outline is structure-only (empty text placeholders); charts/graphics are not converted to test/metric blocks.
• Follow-up backend#3415 (cancel stuck PDF parse) is not documented here.

Dependencies, breaking changes, and deployment notes

• Depends on merged FE/BE for SC-16316
• No breaking docs changes

Release notes

Customer Admins can create blank document templates under each document type, or generate a structure-only outline from a PDF with selectable text. Duplicate and delete remain available from the templates list and template details. Learn more ...

Checklist

• What and why
• Screenshots or videos (Frontend)
• How to test
• What needs special review
• Dependencies, breaking changes, and deployment notes
• Labels applied (documentation)
• PR linked to Shortcut
• Unit tests added (Backend)
• Tested locally
• Documentation updated (if required)
• Environment variable additions/changes documented (if required)